Joseph s



current of dust-laden air being forced into the spout b,in the usualmanner,it Will be seen that the force of the current traveling in acircle through the chamber d tends to drive the particles of dustagainst the outer wall of the chamber, the wings g operating to guidethe same out through the slots f and allow it to escape into the spacebetween said chamber and the wall ol' the box A. The centrifugal forceof the air which escapes with the dust through the slots against theinner surface of the box A will cause the heavier ingredients to followsaid inner surface spirally downward until they reach and pass out theopening a' in the bottom of the box. The surplus air which fails to passthrough the slotsf,hav ing been purified by its passage through thecircular chamber d, will pass out through the the air-hole h in thetopplate,a,being deflected upwardly by the inclined partition of the end ofthe chamber. It will also be seen that the central pipe,c,will afford anescape for the air within the cone, the latter having been separatedfrom the dust,as above described.

The difficulty usually experienced in theuse of dustcolleetors whereinthe ingoing and outgoing currents ofair are made to meet,thus retardingthe force of the current and again mingling the purified orpartially-purified air with the dust-laden current,is,as Will be seen,readily obviated by the construction of my device.

It will also be seen that by means of the damper K, adapted to beoperated from the exterior of the box, the size of the slots .may beregulated to conform not only to the character of the dirt to passtherethrough,but to the amount of draft desired.

I do not'claim in this case the construction claimed by me in anotherapplication for patent bearing Serial No. 264,009.

Having now fully described my invention,

a, having acentral vertical pi pe,c, therein and an opening, h,on oneside of said pipe, an interior wall forming an annular chamber,

around said central pipe, and a lateral inlet-' spout,b,leading intosaid annular chamber,the outer wall of said chamber having verticalslots,and a curved slotted damper held against said wall and controlledsubstantially as described.

2. In a dust-collector, the combination of a cylindrical box having aconical bottom and an opening, a', in the bottom thereof, a top plate,a, having a central vertical pipe, c', therein, an interior wall formingan annular chamber, d, around said central pipe, and a lateralinlet-spout, b,'leading into said annular chamber, the outer wall ofsaid chamber having vertical slots and inwardly-projecting Wings g, andacurvcd slotted damper held against said Wall, substantially asdescribed.

.3. A dustcollector consisting of a cylindrical box having a top plate,a conical bottom, a central vertical pipe therein, an iute,

rior wall forming an annular chamber, d, around said central pipe, and alateral inletspout leading into said cylindrical box and into saidchamber d, the outer walls of said chamber d having vertical slots, anda curved slotted damper loosely held against said wall and provided witharms projecting through curved slots in said top plate for actuatingsaid damper.

JOSEPH S. ASH.

Vitnesses: v

ALEX. H. JoHNsoN, C. B. CURRIER.

